Malicious PDF — malware analysis report

Static analysis result for SHA-256 f552ce48d71186ec…

MALICIOUS

PDF

75.8 KB Created: 2021-09-14 02:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d0a6da12dd69c47156e9e290e246ac5 SHA-1: f5145df71fbe44453f211f88f5f2419170ddd2af SHA-256: f552ce48d71186ec4e4caa8994fea83d0bc9ad2d7fb3d0cf05b579c8892e83bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF contains numerous links to disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links point towards an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://yasairamenbar.com/uploads/files/fisozesosux.pdf In PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/95435123200.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/gujelaxukuxikigup.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/818b40fb82c205498b38d18d14c093e0/89962377660.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/jakepazupekorimitepibav.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/963502383.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/42052863386.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/6130719403.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/75446261797.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/wazapoxefa.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/23560349009.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/wazovosexumugamaxatebedon.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/xubimozatukipetedobasadu.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/qo5kdpqs3376p9oassn4a1cg6r/petituvuzuwewir.pdfIn PDF document text
    • http://www.springperfect.com/upload/finder/files/74036604663.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/14608266874.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/68386967927.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/23571396311.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/vazipuvi.pdfIn PDF document text
    • http://medrea.ru/upload/files/24763479425.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/59011543553.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/sebejibijilumunosigiteke.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/5550614582.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/17582271307.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/tokakonapowiwupimila.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/navililuzogebefipidaf.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/seduzamawuwevugobuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gospel+song+you+are+my+strengthPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 10860 bytes
SHA-256: d2b31584ee48508e7ef6bc0364f6bee35a5cfcb55b146f2fb04a813aa3a80d69
font_02_sfnt_off0000f3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FF 17504 bytes
SHA-256: acb517992aa8ffdc819bbbe264b253925262c5c24435a5855ecce426ba46d645